Final Reg Current and Circuits Review SHORT ANSWER. Write the word or phrase that best completes each statement or answers the question.

Transcription

1 Final Reg Current and Circuits Review SHORT ANSWER. Write the word or phrase that best completes each statement or answers the question. 1) How much energy does a 100-W light bulb use in 8.0 hours? 1) 2) If the resistance in a constant voltage circuit is doubled, the power dissipated by that circuit will 2) FIGURE ) If 1.5 A flows through R2, what is E in Fig. 19-2? 3) 4) What is the total resistance of the circuit in Fig. 19-2? 4) 5) If E = 40 V, what is the voltage on R1 in Fig. 19-2? 5) 6) If E = 20 V, what is the current through R3 in Fig. 19-2? 6) 7) How much energy does a 25-W soldering iron use in 8.0 hours? 7) 8) If the resistance in a circuit with constant current flowing is doubled, the power dissipated by that circuit will 8) 9) When resistors are connected in parallel, we can be certain that 9) 10) If the current flowing through a circuit of constant resistance is doubled, the power dissipated by that circuit will 10) 11) How much charge must pass by a point in 10 s for the current to be 0.50 A? 11) 12) Three identical resistors are connected in parallel to a 12-V battery. What is the voltage of any one of the resistors? 12) 13) Four 20- resistors are connected in series. What is the equivalent resistance? 13) 14) What is the voltage across a 5.0- resistor if the current through it is 5.0 A? 14) 15) Four resistors of 12, 3.0, 5.0, and 4.0 are connected in series. A 12-V battery is connected to the combination. What is the current through the battery? 15) 1

2 16) What is the nominal resistance of a 100-W light bulb designed to be used in a 120-V circuit? 16) 17) A 22-A current flows into a parallel combination of a 4.0-, 6.0-, and 12- resistors. What current flows through the 6.0- resistor? 17) 18) What is 1 W equivalent to? 18) 19) A lamp uses a 150-W bulb. If it is used at 120 V, what current does it draw? 19) 20) Three identical resistors are connected in parallel to a battery. If the current of 12 A flows from the battery, how much current flows through any one of the resistors? 20) 21) The resistance of a wire is defined as 21) FIGURE ) For the circuit in Fig. 19-4, determine the current in the 4- resistor. 22) 23) For the circuit in Fig. 19-4, determine the current in the 3- resistor. 23) 24) For the circuit in Fig. 19-4, determine the current in the 1- resistor. 24) 2

3 FIGURE ) What is the total resistance of the circuit in Fig. 19-3? 25) 26) If E = 4.0 V, what is the current through R6 in Fig. 19-3? 26) 27) If E = 100 V, what is the voltage across R5 in Fig. 19-3? 27) 28) A 14-A current flows into a series combination of a 3.0- and a 4.0- resistor. What is the voltage drop across the 4.0- resistor? 28) 29) A 3.0- resistor is connected in parallel with a 6.0- resistor. This combination is connected in series with a 4.0- resistor. The resistors are connected to a 12-volt battery. How much power is dissipated in the 3.0- resistor? 29) 30) A total of protons pass a given point in 15 s. What is the current? 30) 31) Two 4.0- resistors are connected in parallel, and this combination is connected in series with 3.0. What is the effective resistance of this combination? 31) 32) A coulomb per second is the same as 32) 33) Two resistors of 5.0 and 9.0 are connected in parallel. A 4.0- resistor is then connected in series with the parallel combination. A 6.0-V battery is then connected to the series-parallel combination. What is the current through the 4.0- resistor? 33) 34) Three resistors of 12, 12, and 6.0 are connected in series. A 12-V battery is connected to the combination. What is the current through the battery? 34) 35) Two resistors of 15 and 30 are connected in parallel. If the combination is connected in series with a 9.0-V battery and a 20- resistor, what is the current through the 15- resistor? 35) 36) A 22-A current flows into a parallel combination of a 4.0-, 6.0-, and 12- resistor. What current flows through the 4.0- resistor? 36) 37) A 25-W soldering iron runs on 110 V. What is its resistance? 37) 3

4 38) Three identical resistors are connected in series to a 12-V battery. What is the voltage across any one of the resistors? 38) 39) A combination of 2.0 in series with 4.0 is connected in parallel with 3.0. What is the equivalent resistance? 39) 40) A charge of 12 C passes through an electroplating apparatus in 2.0 min. What is the average current? 40) 41) Three identical resistors are connected in series to a battery. If the current of 12 A flows from the battery, how much current flows through any one of the resistors? 41) 42) What current is flowing if 0.67 C of charge pass a point in 0.30 s? 42) 43) Two resistors of 5.0 and 9.0 are connected in parallel. A 4.0- resistor is then connected in series with the parallel combination. A 6.0-V battery is then connected to the series-parallel combination. What is the current through the 5.0- resistor? 43) 44) A 14-A current flows into a series combination of a 3.0- and a 4.0- resistor. What is the voltage drop across the 3.0- resistor? 44) 45) A light bulb operating at 110 V draws 1.40 A of current. What is its resistance? 45) 46) The total amount of charge that passes through a wire's full cross section at any point per unit of time is referred to as 46) 47) Three resistors of 12, 12, and 6.0 are connected in parallel. A 12-V battery is connected to the combination. What is the current through the 6.0- resistor? 47) 48) What current is flowing if electrons pass a point in 0.50 s? 48) 49) When two or more resistors are connected in series to a battery 49) 50) The direction of convention current is taken to be the direction that 50) 51) Three resistors of 4.0, 6.0, and 10.0 are connected in parallel. If the combination is connected in series with a 12.0-V battery and a 2.0- resistor, what is the current through the resistor? 51) 52) As more resistors are added in parallel to a constant voltage source, the power supplied by the source 52) 53) If the voltage across a circuit of constant resistance is doubled, the power dissipated by that circuit will 53) 54) A resistor is connected across 220 V. What current will flow? 54) 4

5 55) A 1500-W heater is connected to a 120-V line for 2.0 hours. How much heat energy is produced? 55) 56) When resistors are connected in series, 56) 57) A toaster is rated 800 W at 120 V. What is the resistance of its heating element? 57) 58) 5.00 A is flowing through an 10.0 resistor. How much power is being dissipated? 58) 59) When two or more resistors are connected in parallel to a battery, 59) 60) A 110-V hair dryer is rated at 1200 W. What current will it draw? 60) 61) What potential difference is required to cause 4.00 A to flow through a resistance of 330? 61) 62) A 22-A current flows into a parallel combination of 4.0, 6.0, and 12 resistors. What current flows through the 12- resistor? 62) 63) A 6.0- and a 12- resistor are connected in parallel to a 36-V battery. What power is dissipated by the 6.0- resistor? 63) 64) A 2.0- resistor is in series with a parallel combination of 4.0, 6.0, and 12. What is the equivalent resistance of this combination? 64) 65) A lamp uses a 150-W bulb. If it is used at 120 V, what is its resistance? 65) 66) A 150-W light bulb running on 110 V draws how much current? 66) 5